Tool



1,635,968 July 12 1927. c STROBL TOOL Filed June 19 1.925 2 Sheets-Sheet l I ffyf ATTO INEY INVENYOR J y 119 f c. STROBL I TOOL Filed June 19. 1925 2 sheetsh t 2 IMVENTOR W BY ATTOR Patented July 12, 1927.

an sures CHARLE s'rRoBL, or Amman, wrsoousm,

ab maammediune 19, 1926; Serial at. 117,148:

This invention relates to tbOlSyflIld .has particular application to a tool for grinding the cylinders of an engine; to render the walls thereof perfectly round and smooth, a necessary condition for efficiency in operation.

In carrying; outthe invention I contemplatethe use of acircumferential' series of grinding tools mounted'on a frame for. rotation therewith, together with a novel construction and arrangement ofparts for-exerting an outward pressure against said tools to hold them in effective engagement with the wall of the cylinder being dealt; with, so thatthe work can be accomplished in an efficient manner and in comparatively quick'order.

Another object of the invention resides in the provision of means for adjusting the grinding tools so as to limit the outward movement thereof under the influence of the yieldable means, thus preventing the cylinder wall from being cut or ground too deeply. 7

Other objects and advantages will appear when the following detail description is read in connection with the accompanying drawings, and wherein like numerals of reference indicate similar parts in the several views. v v

Figure 1 is a view in elevation of the tool forming the subject matter of the present invention. I I

Figure 2 is a sectional view on line 2-2 of Figure 1.

T igure3 is a-sectional view on line 33 of Figure 2. v

Figure lis a plan view on one sideof the frame. I v

Figure 5 is a detail view of one of the rods used with each grinding tool.

Figure-6 is aperspective view of one of the tool holders.

The tool forming the subject matter of the present invention essentially embodies a shaft 10 adapted to be rotated within the cylinder by any suitable means, preferably by a portable electric motor (not shown). Carried by one end of the shaft is a framelike supporting structure, preferably including spaced plates 11, and while these plates may vary in size and configuration, they are preferably of the shape illustrated in Figure 4:. T e plates are provided with central openings 12 to receive the shaft 10 andv notched as at 13 to accommodate a key 14 by means of which the frame-like structure is heldfixed to the shaft. Suitable washers 15 are alsomounted on the shaft and arranged to engage the adjacent plates of the frame. The plates 11 are connected to gether by bolts? 16which connect the corresponding' corners of the plates, while also connecting the plates together is a plurality ofbolts'17 which are arranged inwardly of the bolts 16 for a purpose to be hereinafter described. V

Supported on the frame is" a plurality of tools designedto accomplish-the above mentioned purpose, and eacli tool' 18 is fixed to a carrier 19 of the construction illustrated in Figure 6.- i As all of the tools and car'- riers therefor are identical in construction, a detail description of one will suflice for all.

Each carrier consists of a curved plate 19 provided with suitable openings 20 --to accommodate rivets or other suitable fasteningelements 21 employed for holding the tool 18 onthe carrier. In this connection it might be statedthat the openings in the tool areshapedto allow the heads of the rivets or other fastening elements 21 to be counter-sunk, so that they will not come in contact with the wall of the'cylinder while the tool is in use; One end of-the carrier 19 is rolled inwardly upon itself-to'provide a tubular portion 22 to receive one of the bolts 16, the latter constituting a*pivot upon which the. carrier moves toward and away from the wall-of the cylinderin the'manner to be hereinafter described. The other end of the carrier is offset inwardly as at 23 and then extendedoutwa-rd-ly as'at 24-to provide anattachingflange for association with a rod25 which is threaded for a portion of its length-as at26, and formed with an eye 27 at oneend thereof. The flange 24 is also providedwith a central openin'g28 to receive the adjacent rod 25 upon which the carrier slides incident to the pivotal movement of the carrier on its pivot 16. The eye 27 of the rod 25 is received by one of the inner bolts 17, and extends therefrom beyond the edge of the plates 11 of the frame for connection with the adjacent carrier as shown in Figure 2. These rods 25 are arranged centrally of the bolts 17 and maintained in this position by sleeves 29 which surround the bolts 17 at opposite sides of the eye 27 of said rod. Surrounding the.

able prongs 32 to engage the adjacent-convolutions of the spring and thus prevent the spring from twisting upon the rod. The spring 30 has one end bearing against the eye 27 of the rod and its other end bearing against the flange 24 of the carrier, while threaded upon the outer end of the rod 1s a nut 33 which is utilized to adjust the tension of the spring, and also to limit the outward movement of the carrier and its tool with relation to the wall of the cylinder; This obviously prevents the tool from cutting the wall of the cylinder too deeply as will be readily appreciated. As shown in Figure 2 the tools are arranged circumferentially about the shaft 10. and the number of tools used depends upon the size of the latter, and can be varied withoutdeparting from the inventive idea.

In practice it is only necessary to adjust the nuts 33 so as to limit the outward movement of the various tools arranged circumferentially about the shaft 10, and then place the tool in its entirety within the cylinder, wherein the tools are held in effective engagement with the wall of the latter under the action of the springs 30. The shaft 10 is then rotated, and as the wall of the cylinder is ground, the springs gradually move the cutting tools and their *arriers outwardly, until the flanges 24 strike the nuts 33, which as above stated prevent further outward movement of said cutting tools. The invention is simple in construction, and highly efficient in operation for the purpose intended.

hile it is believed that from the foregoing description, the nature and advantages of the invention will be readily apparent, I desire to have it understood,that I do not limit myself to what is herein shown and described and that such changes may be resorted to when desired as fall within the scope of what is claimed.

\Vhat is claimed is: p

1.. In a tool of the cl'nlracter described, a rotatable shaft, a frame mounted on one end of the shaft for rotation therewith, a circumferential series of tool carriers pivotally mounted on said frame, each carrier terminating to provide an offset apertured extremity, grinding tools associated with said carriers, rods pivotally supported on said frame and upon which the said apertured extremities of said carriers slide, springs surrounding said rods and arranged to exert an outward pressure on said carriers, and means on the outer ends of said rods for limiting the outward movements ofsaid carriers for the purpose specified.

2. In a tool of the character described, a rotatable shaft, a frame comprising spaced plates mounted on the shaft for rotation therewith, inne'rand outer series of bolts connecting said plates, a circun'iferential series of tool carriers pivotally mounted on the outer series of said bolts, grinding tools associated with said carriers, rods supported on the inner series of said bolts and projecting beyond the edges of said plates, and

slidably supporting the adjacent ends of said carriers, coil springs surrounding said rods and exerting an outward pressure on said carriers, and nuts threadedly adjustable on the projecting ends of said bolts for limiting the movements of said carriers under the influence of said springs.

23. In a tool of the character described, a rotatable shaft, a frame con'iprising spaced plates mounted upon the shaft for rotation therewith, inner and outer series of bolts connecting said plates, a circumferential series of tool carriers arranged about the shaft, each carrier including a curved body portion terminating-to provide a loop to receive one of the outer series of bolts, upon which said carriers are pivotally mounted, an offset apertured flange arranged at the other end of each carrier, rods supported upon the inner series of bolts and received by the apertures of said flanges, whereby said carriers are slidable upon said rods, coil springs surrounding said rods and exerting outward pressures upon said carriers, nuts threaded on said rods andadjustable to limit the movements of the carriers under the influence of said springs, and grinding 'tools mounted on the carriers.

ture.

CHARLES STROBL.

In testimony whereof I ariix my signae 

